Mixing tuyere



June 19, 1951 L. CHABOISSEAU 2,557,596

MIXING TUYERE.

Filed July 10, 1947 Patented June 19, 1951 UNETED 2,557,596 MIXING TUYERE Lucien Chaboisseau, Montreuil-sous-Bois, France, assignor to Sccicte de Robinetterie S. A. J., Paris, France, a company Application July 10, 1947, Serial No. 760,174 In France December 29, 1945 Section 1, Public Law 690, August 8, 1946 Patent expires December 29, 1965 3 Claims. (01. 103-277) This invention relates to mixing tuyres comprising a movable member, or shutter or flap, for improving the priming of the apparatus and especially although not exclusively to re-start ing injectors, i. e. automatic priming devices.

In such apparatus, the convergent tuyere, or mixing cone, comprises a shutter which is jointed to the fixed body of the tuyere in such a manner that when the apparatus is starting up its mouth avoids the recompression of the gas in the cone of the tuyre; the said shutter resuming its position as soon as the water sucked in by the Opening produced has ensured the condensation of the gas.

According to this invention there is provided an improved mixing tuyere in which the contact surfaces of the tuyre and of its movable shutter are not plane surfaces, as in known injectors, but are cylindrical surfaces.

Because of this improvement, the manufacture of the tuyre and its shutter may be effected as a turning operation while in the known injectors, with plane contact surfaces, the shutter is usually countersunk on the mixing tuyere and is fitted by hand; the manufacturing operation permitted by a construction according to this invention is therefore quicker and simpler as well as allowing of the construction of a number of parts on a lathe at the same time. Moreover, the-small wings which are often formed on the shutters to serve as guides are not necessary.

Reference will now be made to the accompanying diagrammatic drawings which illustrate by way of example a preferred embodiment of the invention and in which:

Figure 1 is a plan view of a mixing tuyre constructed in accordance with the invention.

Figure 2 is a sectional elevation.

Figure 3 is a transverse section taken on the line IIIIII of Figure 2 while Figure 4 is a transverse section taken on the line IV-IV of Figure 2.

In accordance with this invention, a mixing tuyere comprises a fixed hollow body I formed with an inlet la for water and gas. The body I has a substantially conical part 5 having a portion of the upper perimeter thereof cut away so as to form an opening being arranged substantially in the longitudinal direction of the body I and having along the opposite edges thereof longitudinal contact surfaces 4. An open cavity lb is formed at the other end ofthe body adjacent to the narrower end of the conical part and communicates with an overflow and a discharge tuyere is screwed into a threaded socket lc at the 2 same end. A shutter 2 is pivoted about a spindle 3 which is arranged at the edge of the opening in the body I.

In accordance with the invention, the body I of the tuyere and the articulated shutter 2 are arranged with the contact surfaces 4 being shaped as parts of a cylindrical surface having a curvature inclined by an arc of a circle. The shutter 2 and the opening of the conical part are provided with plane transverse surfaces 6 which come into engagement with each other in the closing position of the shutter. The shutter 2 reaches with its forward end as far as the capacity lb so that it can be easily swung in and out of closing position and the forward end of the shutter 2 need not be accurately made since it does not'matter whether the same projects a little bit to the cavity lb passing through the axis of the nozzle.

I claim:

1. A mixing tuyere comprising in combination, a hollow body having a substantially conical part having a portion of the upper perimeter thereof cut away so as to form an opening being arranged substantially in the longitudinal direction of said body and having along the opposite longitudinal edges thereof contact surfaces; a shutter designed so as to fit said opening in said conical part of said body and having along the opposite longitudinal edges thereof contact surfaces engaging in the closing position of said shutter said contact surfaces of said conical part of said body; and a pivotal connection between said conical part of said body and said shutter, whereby said shutter may be swung in and out of closing position, the contact surfaces of said conical part and of said shutter being shaped as parts of a surface having a curvature defined by an arc of a circle passing through the axis of said body, whereby the contact surfaces of said body and said shutter can be turned simultaneously on a lathe.

2. A mixing tuyre comprising in combination, a hollow body having a substantially conical part having a portion of the upper perimeter thereof cut away so as to form an opening being arranged substantially in the lonand said shutter, whereby said shutter may be swung in and out of closing position, the contact surfaces of said conical part and of said shutter being shaped as parts of a cylindrical surface having a curvature defined by an arc of a circle passing through the axis of said body, whereby the contact surfaces of said body and said shutter can be turned simultaneously on a lathe.

3. A mixing tuyere comprising in combination, a hollow body having a substantially conical part having a portion of the upper perimeter thereof cut away so as to form an opening being arranged substantially in the longitudinal direction of said body and having along the opposite longitudinal edges thereof contact surfaces; an open cavity formed in said body adjacent to the narrower end of said conical parts; an overflow forming part of said body and communicating with said cavity at the end thereof opposite to said conical parts; a shutter designed so as to fit said opening in said conical part of said body and having along the opposite longitudinal edges thereof contact surfaces engaging in the closing position of said shutter said contact surfaces REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Davies et al Mar. 12, 1895 Metcalfe et al Jan. 16, 1923 True Aug. 8, 1933 FOREIGN PATENTS Country Date .Great Britain Mar. 20, 1930 Number Number 

